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Home >> Genesis >> 2021 >> G90 5.0 Ultimate, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 30 (Engine Control System Diagnosis - 3.3L (5 Of 9)) >> DTC P0420-00: Catalyst System Efficiency Below Threshold (Bank 1) >> DTC Information >> DTC Description

DTC Description

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The ECM calculates oscillation size of rear HO2S signal which represents catalyst conversion properties. This oscillation size will determine if catalyst conversion is low due to aging or poisoning from leaded fuel or misfiring. The ECM sets P042000 if the average of calculated oscillation size of rear HO2S signal during predetermined duration is higher than the predetermined threshold.

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